To fix the active P2583-54 (Millimeter Wave Radar Aiming Incomplete) code on a 2017–2021 Honda Civic, you must successfully complete a Static or Dynamic Radar Aiming sequence using an OE-level scan tool. This code means a calibration routine was initiated (usually after a collision repair, bumper removal, or sensor replacement) but was aborted or failed to finish. It will remain locked in memory until a calibration cycle registers a 100% complete status.
On 2017–2021 models (10th Generation Civic), the radar sensor is located off-center on the driver-side (left) front bumper fog light garnish. This offset placement requires highly precise target positioning if you choose the in-shop method.